Capacitor motor



. July 4, 1933. Y H, G. Ross 1,916,389

CAPACITOR MOTOR 1 Filed Feb. 28, 1931 WITNESSES: INVENTOR (9%? Hugh 6: Ross. 1% 1 phase capacitor motor,

denser connected to the outsi e type employed in such motors.

Patented I 4, 1933 UNITED STATES PATENT OFFICE ELECTRIC & MANUFACTURING COMPANY, A

CORPORATION OF PENNSYLVANIA CAPACITOR MOTOR Application am February 28, 1881. Serial No. 519,116.

My invention relates to alternating-current motors and particularly to capacitor motors.

An object of my invention is to provide a relatively simple construction-forafsinglein which the condenser isto be energized ata' voltage'-higher than the line-energizing voltage. f

In practicing my invention, Iprovidean induction motor embodying a rotor of any desired design, a stator structure having a.

main energizing winding,

and a two i part auxiliary energizing windin and a conterminals of the two auxiliary windings.

The single figure of the drawing illustrates schematically, an induction motor embodying my invention.

A capacitor motor 11 includes a rotor 12, which is here shown as of the s uirrel cage construction but which may be di any other I have not s own a shaft for the rotor or bearings for the shaft, as such elements constitute no particular part of my present invention and have, therefore, been omitted for the sake of clearness.

A tions 13' embodying the usual yoke portion and a plurality of pairs of salient pole pieces 14. While I have illustrated a particular embodiment of a stator and more particularly of the laminations thereof, I desire it to be understood that any stator structure, effective for the same general purpose, may ployed and that I do not wish to be restricted to the use of salient poles. It is further-to be understood that the stator structure has associated therewith, the usual bearing brackets for supporting the shaft of the rotor 12.

The stator has located thereon a main winding, including, in this particular case, two coils 16 and 17 and an auxiliary winding which is displaced by ninety electrical degrees from the main windings and includes two portions 18 and 19 on each of the other salient poles, as shown in the drawing. A supply circuit for the motor includes supplycircuit conductors 21 and 22, and the main winding coils 16 and 17 are connected in substantially twice stator structure includes a set of laminabe em series-circuit relation directly across the supply-circuit conductors 21 and 22.

The energizing circuit is connected to one terminal 0 one of the auxiliary winding coils 18 and to the other terminal-of the second coil 18. A condenser 23 is connected to the extreme outer terminals of all of the series-connected windings 18 and 19, theeficct being that one-half of the auxiliary windings, and particularly the coils 18, are connected across the conductors 21 and 22 of the supply circuit to be energized thereby, while the condenser will be energized by the combined effect of the two sets of coils 18 and 19, and the voltage at the terminals of the condenser will, therefore, be much higher than that of thcencrgizing circuit.

Thus, if the number of turns in windings 18 is the same as that in windings 19, the voltage supplied to the condenser 23 will be that of the supply circuit, and the necessary capacitance will, therefore, be reduced to oneourth, for reasons well known in the art.

The device embodying my invention thus provides a stator structure for a motor in which the auxiliary windings are effective not only to provide a second phase electrically displaced relatively to the first or main phase winding, but the auxiliary windings located on the stator structure constitute also a step-up transformer to energize a condenser at a higher voltage to thereby permit of reducing the capacity of the condenser, while still obtaining the desired results.

It is obvious that the stator structure may be i such limitations shall be placed thereon as are imposed by the riorarterereset forthin the a pended claima I c aim as my invention:

1. A capacitor motor including a rotor, a stator-structure having wound thereon a main winding energized at linevoltage and an auxiliary winding, a predetermined rtion of which, less than the total, is enerd at line voltage, and a capacitor electrically connected to the rum of the auxiliary winding.

2. A capacitor motor for eneration at a normal voltae and including a rotor, a stator structure waving Wound thereon a main winding energized at. normal volta e and an auxiliary winding a ca acitor cectrically connected to the terminae of the auxiliary winding and means for ener 'zing a predetermined portion, less than t e total, of the auxiliary winding at normal voltage.

3. A capacitor motor including a rotor, a

means for directly energizing the main windingand a portion only of the auxiliary windin at a predeterined voltage.

testimony whereof, I have hereunto subscribed my name this 17th day of February HUGH G. ROSS. 

